10 weeks post lipo. Is it normal to feel burning and ripping sensations when sitting up?

I had lipo on my lower abdomen, sides lower back,and arms. After having the surgery I returned to work after ten days.. I work in the medical field ad a PCT so my work can be strenuous. My questions that I worry about the most is, Is it normal to experience ripping pains when I'm sitting up, and it feels like the area around my abdomen is warm to the touch. Also does having a memory foam mattress contribute to my discomfort ? Thanks for your help, Yasmeen